US3351438A - Tungsten incandescent body of large crystalline structure and process for its production - Google Patents
Tungsten incandescent body of large crystalline structure and process for its production Download PDFInfo
- Publication number
- US3351438A US3351438A US395797A US39579764A US3351438A US 3351438 A US3351438 A US 3351438A US 395797 A US395797 A US 395797A US 39579764 A US39579764 A US 39579764A US 3351438 A US3351438 A US 3351438A
- Authority
- US
- United States
- Prior art keywords
- tungsten
- gallium
- large crystalline
- crystalline structure
- prepared
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01K—ELECTRIC INCANDESCENT LAMPS
- H01K3/00—Apparatus or processes adapted to the manufacture, installing, removal, or maintenance of incandescent lamps or parts thereof
- H01K3/02—Manufacture of incandescent bodies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/16—Making metallic powder or suspensions thereof using chemical processes
- B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/16—Making metallic powder or suspensions thereof using chemical processes
- B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
- B22F9/20—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from solid metal compounds
- B22F9/22—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from solid metal compounds using gaseous reductors
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B34/00—Obtaining refractory metals
- C22B34/30—Obtaining chromium, molybdenum or tungsten
- C22B34/36—Obtaining tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/045—Alloys based on refractory metals
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
- C22C27/04—Alloys based on tungsten or molybdenum
Definitions
- ABSTRACT OF THE DISCLOSURE A sintered tungsten body of large crystalline tungsten structure which contains gallium as Well as an alkali metal and silicon. The same is produced by a process by adding to a tungsten acid paste, a solution incorporating potassium and silicon, as a potassium silicate, and a solution of a gallium compound; the gallium content in the initial paste composition expressed in a Ga O :WO ratio being in the range of 0.00001:1 to 0.05:1, and the initial past composition aforesaid being dried and dehydrated and then reduced to metal powder in the hydrogen stream at high temperature, the metal powder so prepared being processed to a rod by pressing and sintering followed by swaging and wire drawing.
- tungsten in its pure condition is unsuitable for uses where it is subjected to heating at high temperatures and where a deformation during heating or breaking during mechanical stresses after heating are not permissible.
- additives are used which transform the tungsten structure into a large crystalline structure.
- the most suitable composition is the one where K, Si and A1 are added, and the additives are generally admixed to the oxide of the tungsten prior to its reduction to a metal.
- the tungsten thus containing K, Si and Al however also has certain drawbacks, although the incandescent bodies prepared therefrom are not deformed during the heating and retain sufiicient plasticity after their heating.
- One detrimental feature of such tungsten is that its processing (swaging, wire-drawing, spiralisation) is more difficult and involved more waste than does tungsten not containing the three above mentioned additives in combination and which, therefore does not have such a large crystalline structure.
- Another disadvantageous fact is that even the good properties are lost if the protective gas atmosphere in which heating is performed contains even the slightest amount of impurities. Thus, even a Water vapour and oxygen-content of the protective gas is detrimental.
- the gallium content of the large crystalline tungsten body should be in the order of magnitude of at least 0.0001%.
- the gallium content of the initial material should be therefore-expressed in a Ga O :WO ratiobetween 0.00001:1 to 0.05: 1.
- tungsten acid paste so prepared is dried, dehydrated at 300 C., and then reduced to metal powder in a hydrogen stream (current) at temperatures rising up to 850 C.
- the metal powder so prepared is processed in the manner usual in tungsten manufacture to a compound rod by pressing and sintering.
- the rod contains gallium in a demonstrable amount, and the manufacturing conditions may be set soin the manner known in tungsten manufacturethat visible crystals should be present on its surface.
- the large crystalline incandescent filament of for example 220 volt 40 Watt incandescent lamps can be obtained from this rod by swaging, wire-drawing and spiralisation.
- FIG. 1 illustrates a tungsten rod made of tungsten prepared according to the present invention
- FIG. 2 illustrates a tungsten filament made of tungsten prepared according to the present invention
- FIG. 3 illustrates an incandescent lamp containing a tungsten filament prepared according to the present invention
- a sintered tungsten body according to claim 1 said body also containing silicon expressed as SiO in an amount of about 0.3% by weight, and potassium expressed as KCl in an amount of about 0.4% by weight.
Description
Nov. 7, 1967 -r N R ET AL 3,351,438
-TUNGSTEN INCANDESCENT BODY OF LARGE CRYSTALLINE STRUCTURE AND PROCESS FOR ITS PRODUCTION Filed Sept. 11. 1964 WWI-HM Wm F/g. 4 Fig. 2
Fig. 5
INVENTORS BY MW WW United States Patent and Laszlo Kernyi, Egyesult Izzolampa Budapest, Hungary,
ABSTRACT OF THE DISCLOSURE A sintered tungsten body of large crystalline tungsten structure which contains gallium as Well as an alkali metal and silicon. The same is produced by a process by adding to a tungsten acid paste, a solution incorporating potassium and silicon, as a potassium silicate, and a solution of a gallium compound; the gallium content in the initial paste composition expressed in a Ga O :WO ratio being in the range of 0.00001:1 to 0.05:1, and the initial past composition aforesaid being dried and dehydrated and then reduced to metal powder in the hydrogen stream at high temperature, the metal powder so prepared being processed to a rod by pressing and sintering followed by swaging and wire drawing.
It is known that tungsten in its pure condition is unsuitable for uses where it is subjected to heating at high temperatures and where a deformation during heating or breaking during mechanical stresses after heating are not permissible. In order to render the tungsten suitable for such purposes, additives are used which transform the tungsten structure into a large crystalline structure. When the tungsten has acquired such structure and has the form of a wire, a helix or the like, it becomes suitable for the above mentioned purposes. The most suitable composition is the one where K, Si and A1 are added, and the additives are generally admixed to the oxide of the tungsten prior to its reduction to a metal.
The tungsten thus containing K, Si and Al however also has certain drawbacks, although the incandescent bodies prepared therefrom are not deformed during the heating and retain sufiicient plasticity after their heating. One detrimental feature of such tungsten is that its processing (swaging, wire-drawing, spiralisation) is more difficult and involved more waste than does tungsten not containing the three above mentioned additives in combination and which, therefore does not have such a large crystalline structure. Another disadvantageous fact is that even the good properties are lost if the protective gas atmosphere in which heating is performed contains even the slightest amount of impurities. Thus, even a Water vapour and oxygen-content of the protective gas is detrimental.
It has been found that the described disadvantages are eliminated to a large extent if gallium is added to the tungsten instead of aluminum in addition to Si and alkali metals, e.g. K. In this case none of those desired properties are lost which, as was up to now believed, required the presence of aluminum. At the same time, a readily workable metal is obtained, which is less sensitive to the impurities (contaminations) of the protective gas and whose strength increases with recrystallisation.
The gallium content of the large crystalline tungsten body should be in the order of magnitude of at least 0.0001%. The gallium content of the initial material should be therefore-expressed in a Ga O :WO ratiobetween 0.00001:1 to 0.05: 1.
3,351,438 Patented Nov. 7, 1967 The tungsten incandescent body according to the invention having a large crystalline structure may be prepared in the manner described below. It is understood that this example merely serves as an illustrative embodiment.
To tungsten acid (WO .H O) paste a potassium silicate solution is added in such an amount that the K content expressed in KCl is 0.40%, the Si content expressed in SiO is 0.30%, and the solution of Ga(NO is added in such an amount that the Ga content expressed in Ga O is 0.05%. The tungsten acid paste so prepared is dried, dehydrated at 300 C., and then reduced to metal powder in a hydrogen stream (current) at temperatures rising up to 850 C. The metal powder so prepared is processed in the manner usual in tungsten manufacture to a compound rod by pressing and sintering. The rod contains gallium in a demonstrable amount, and the manufacturing conditions may be set soin the manner known in tungsten manufacturethat visible crystals should be present on its surface. The large crystalline incandescent filament of for example 220 volt 40 Watt incandescent lamps can be obtained from this rod by swaging, wire-drawing and spiralisation.
Because of the easier processing, 5% less tungsten powder should be used than in case of the conventional incandescent filaments containing aluminum. The bump test of a lamp provided with such an incandescent filament shows a strength index higher by about 20% than those with conventional filaments. In consequence, the incandescent lamps according to the invention may be applied to good advantage even in fields of application subjected to high shock stresses.
The tungsten incandescent bodies according to the invention may be prepared in various other Ways within the scope of the invention, and may be used not only in incandescent lamps but in other fields of vacuum technics, such as electron tubes, luminescent tubes and the like.
The invention is illustrated by way of example in the accompanying drawing, which forms part of the application and in which:
FIG. 1 illustrates a tungsten rod made of tungsten prepared according to the present invention;
FIG. 2 illustrates a tungsten filament made of tungsten prepared according to the present invention;
FIG. 3 illustrates an incandescent lamp containing a tungsten filament prepared according to the present invention;
FIG. 4 illustrates an electron valve containing a tungsten element prepared in accordance with the present invention; and
FIG. 5 illustrates a fluorescent tube containing tungsten filaments prepared in accordance with the present invention.
What we claim is:
1. A sintered tungsten body of large crystalline tungsten structure eifective for incandescence, said tungsten body containing gallium and in which the gallium to tungsten content expressed as the ratio of Ga O :WO of the initial material from which the tungsten bodyis prepared, is between about 0.00001z1 and 0.05:1.
2. A sintered tungsten body according to claim 1, said body also containing silicon expressed as SiO in an amount of about 0.3% by weight, and potassium expressed as KCl in an amount of about 0.4% by weight.
3. Method of producing sintered tungsten of large crystalline structure, which comprises mixing a gallium compound capable of forming an oxide with tungsten oxide in an amount such that the ratio of Ga O :WO is between about 0.00001:1 and 0.05:1, reducing the resulting oxide mixture to metal powder, and pressing and sintering the resulting metal powder into a solid body.
3 4. Method according to claim 3 in which the reduction to metal powder is carried out in a hydrogen stream at a temperature of up to about 850 C.
References Cited UNITED STATES PATENTS 1,026,384 5/1912 Coolidge 75207 4 Gero 75-207 Hall et a1. 29182 Mason 75207 Pugh et a1. 75207 L. DEWAYNE RUTLEDGE, Primary Examiner.
R. L. GRUDZIECKI, Assistant Examiner.
Claims (2)
1. A SINTERED TUNGSTEN BODY OF LARGE CRSTALLINE TUNGSTEN STRUCTURE EFFECTIVE FOR INCANDESCENCE, SAID TUNGSTEN BODY CONTAINING GALLIUM AND IN WHICH THE GALLIUM TO TUNGSTEN CONTENT EXPRESSES AS THE RATIO OF GA2O3:WO3 OF THE INITIAL MATERIAL FROM WHICH THE TUNGSTEN BODY IS PREPARED, IS BETWEEN ABOUT 0.00001:1 AND 0.05:1.
3. METHOD OF PRODUCING SINTERED TUNGSTEN OF LARGE CRYSTALLINE STRUCTURE, WHICH COMPRISES MIXING A GALLIUM COMPOUND CAPABLE OF FORMING AN OXIDE WITH TUNGSTEN OXIDE IN AN AMOUNT SUCH THAT THE RATIO OF GA2O3:WO3 IS BETWEEN ABOUT 0.00001:1 AND 0.05:1, REDUCING THE RESULTING OXIDE MIXTURE TO METAL POWDER, AND PRESSING AND SINTERING THE RESULTING METAL POWDER INTO A SOLID BODY.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
HUMA001282 | 1963-09-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3351438A true US3351438A (en) | 1967-11-07 |
Family
ID=10998380
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US395797A Expired - Lifetime US3351438A (en) | 1963-09-20 | 1964-09-11 | Tungsten incandescent body of large crystalline structure and process for its production |
Country Status (7)
Country | Link |
---|---|
US (1) | US3351438A (en) |
AT (1) | AT244446B (en) |
CH (1) | CH426005A (en) |
DE (1) | DE1247669B (en) |
GB (1) | GB1081756A (en) |
NL (2) | NL6410632A (en) |
SE (1) | SE303199B (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3475159A (en) * | 1967-01-16 | 1969-10-28 | Dow Chemical Co | Method for preparing tungsten powders doped with refractory metal oxides |
US3838486A (en) * | 1972-03-16 | 1974-10-01 | Egyesuelt Izzolampa | Method for the preparation of tungsten incandescent body containing foreign substances |
US3853492A (en) * | 1972-03-16 | 1974-12-10 | T Millner | Tungsten incandescent body containing foreign substances and procedure for its preparation |
US3927989A (en) * | 1969-09-30 | 1975-12-23 | Duro Test Corp | Tungsten alloy filaments for lamps and method of making |
US4882203A (en) * | 1988-11-04 | 1989-11-21 | Cvd Systems & Services | Heating element |
US4908182A (en) * | 1988-04-11 | 1990-03-13 | Polytechnic University | Rapidly solidified high strength, ductile dispersion-hardened tungsten-rich alloys |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3798008A (en) * | 1972-09-12 | 1974-03-19 | Egyesuelt Izzolampa | Retentive tungsten body containing 20{14 50 ppm titanium and/or zirconium |
GB8703876D0 (en) * | 1987-02-19 | 1987-04-15 | Maloney C E | Pressed thermionic cathode |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1026384A (en) * | 1908-09-23 | 1912-05-14 | Gen Electric | Metal filament. |
US1602526A (en) * | 1922-09-15 | 1926-10-12 | Westinghouse Lamp Co | Control of crystal development in refractory metals |
US2431690A (en) * | 1945-02-21 | 1947-12-02 | Westinghouse Electric Corp | Consolidation of metal powder |
US3210589A (en) * | 1960-04-28 | 1965-10-05 | Westinghouse Electric Corp | Electric incandescent lamp having filament of partially recrystallized fibrous structure |
US3236699A (en) * | 1963-05-09 | 1966-02-22 | Gen Electric | Tungsten-rhenium alloys |
-
0
- NL NL132462D patent/NL132462C/xx active
-
1964
- 1964-09-01 DE DEE27709A patent/DE1247669B/en active Pending
- 1964-09-01 AT AT753464A patent/AT244446B/en active
- 1964-09-01 CH CH1140464A patent/CH426005A/en unknown
- 1964-09-11 US US395797A patent/US3351438A/en not_active Expired - Lifetime
- 1964-09-11 NL NL6410632A patent/NL6410632A/xx unknown
- 1964-09-17 GB GB38040/64A patent/GB1081756A/en not_active Expired
- 1964-09-18 SE SE11263/64A patent/SE303199B/xx unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1026384A (en) * | 1908-09-23 | 1912-05-14 | Gen Electric | Metal filament. |
US1602526A (en) * | 1922-09-15 | 1926-10-12 | Westinghouse Lamp Co | Control of crystal development in refractory metals |
US2431690A (en) * | 1945-02-21 | 1947-12-02 | Westinghouse Electric Corp | Consolidation of metal powder |
US3210589A (en) * | 1960-04-28 | 1965-10-05 | Westinghouse Electric Corp | Electric incandescent lamp having filament of partially recrystallized fibrous structure |
US3236699A (en) * | 1963-05-09 | 1966-02-22 | Gen Electric | Tungsten-rhenium alloys |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3475159A (en) * | 1967-01-16 | 1969-10-28 | Dow Chemical Co | Method for preparing tungsten powders doped with refractory metal oxides |
US3927989A (en) * | 1969-09-30 | 1975-12-23 | Duro Test Corp | Tungsten alloy filaments for lamps and method of making |
US3838486A (en) * | 1972-03-16 | 1974-10-01 | Egyesuelt Izzolampa | Method for the preparation of tungsten incandescent body containing foreign substances |
US3853492A (en) * | 1972-03-16 | 1974-12-10 | T Millner | Tungsten incandescent body containing foreign substances and procedure for its preparation |
US4908182A (en) * | 1988-04-11 | 1990-03-13 | Polytechnic University | Rapidly solidified high strength, ductile dispersion-hardened tungsten-rich alloys |
US4882203A (en) * | 1988-11-04 | 1989-11-21 | Cvd Systems & Services | Heating element |
Also Published As
Publication number | Publication date |
---|---|
NL132462C (en) | |
CH426005A (en) | 1966-12-15 |
NL6410632A (en) | 1965-03-22 |
DE1247669B (en) | 1967-08-17 |
SE303199B (en) | 1968-08-19 |
GB1081756A (en) | 1967-08-31 |
AT244446B (en) | 1966-01-10 |
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